Java number formats?

Question

Hi.
I am writing a program which contains a simple division code. The operation divides a word's frequency in a file by the number of words in that file. This is a code strip
wordCount = wordsInFile(file2); //number of words in file is obtained from a static method
String w = wordFreq.get(i).toString(); // I get the frequency of the word from an array list
double wf = Double.parseDouble(w);
double normalFreq = wf/wordCount;problem is that sometimes this program produces numbers like this : 8.025682182985554E-4
I have no idea what this means and how to fix it. Is there a specific number format that I should use to avoid this?
Thanks!
Message was edited by:
Yorae

Answer 1

Hi.
I am writing a program which contains a simple
division code. The operation divides a word's
frequency in a file by the number of words in that
file. This is a code strip
wordCount = wordsInFile(file2); //number of
words in file is obtained from a static method
String w = wordFreq.get(i).toString(); // I get the
frequency of the word from an array list
double wf = Double.parseDouble(w);
double normalFreq = wf/wordCount;problem is that sometimes this program produces
numbers like this : 8.025682182985554E-4
I have no idea what this means and how to fix it. Is
there a specific number format that I should use to
avoid this?
Thanks!
Message was edited by:
YoraeTake a look at java.text.DecimalFormat
double normalFreq = wf/wordCount;
DecimalFormat df = new DecimalFormat("#.##");
String output = df.format(normalFreq);
System.out.println("The formatted double is " + output);This should truncate any digits after the second decimal place (I think it rounds it for you but I havent checked).